They like to run, too. They don't make runners like other strawberries, the grow underground runner roots that produce new crowns. Pots inhibit that growth, unless you have them in a barrel or something REALLY wide mouthed. Alpines produce many more berries if they can run. The plants we had gave at least a pound per season, and then some, per plant! But they had LOTS of room to grow!
The older crowns produce larger berries, like the ones I'm your picture.
